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                codechef XRQRS                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div>给定一个初始时为空的整数序列（元素由1开始标号）以及一些询问：</div>
<div>类型1：在数组后面就加入数字x。</div>
<div>类型2：在区间L&hellip;R中找到y，最大化（x xor y）。</div>
<div>类型3：删除数组最后K个元素。</div>
<div>类型4：在区间L&hellip;R中，统计小于等于x的元素个数。</div>
<div>类型5：在区间L&hellip;R中，找到第k小的数。</div>
<div></div>
<div></div>
<p></p></p><hr/><h3>输入格式</h3><p><div>输入数据第一行为一个整数q，表示询问个数，接下来q行，每行一条询问 对应题目描述。</div>
<div>类型1的询问格式为&ldquo;1 x&rdquo;。</div>
<div>类型2的询问格式为&ldquo;2 L R x&rdquo;。</div>
<div>类型3的询问格式为&ldquo;3 k&rdquo;。</div>
<div>类型4的询问格式为&ldquo;4 L R x&rdquo;。</div>
<div>类型5的询问格式为&ldquo;5 L R k&rdquo;。</div>
<div></div>
<p></p>
<p></p></p><hr/><h3>输出格式</h3><p><div>对于每个2、4、5询问输出一行对应答案</div>
<div></div>
<p></p>
<p></p></p><hr/><h3>样例输入</h3><pre>10
1 8
5 1 1 1
1 2
2 2 2 7
2 2 2 7
1 1
4 2 2 2
2 1 2 3
4 1 3 5
1 6</pre><hr/><h3>样例输出</h3><pre>8
2
2
1
8
2</pre><hr/><h3>提示</h3><p><div>令N表示每次询问前数组中元素的个数</div>
<div>1&lt;=L&lt;=R&lt;=N</div>
<div>1&lt;=x&lt;=500,000</div>
<div>对于第三类询问 1&lt;=k&lt;=N &nbsp; &nbsp; &nbsp;&nbsp;</div>
<div>对于第五类询问 k&lt;=R-L+1&nbsp;</div>
<div>1&lt;=N&lt;=500,000</div></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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